Man at last knows he is alone in the unfeeling immensity of the Universe, out of which he has emerged only by chance. It is a melancholy thought. I can think of only one thing sadder: if the only animals with self-consciousness, the only species that can light up the Universe with acts of love and humor and compassion, were to extinguish themselves through acts of stupidity.
If we survive, we have a Galaxy to explore and make our own. If we destroy ourselves, if we ruin Earth before we are ready to leave our home planet … well, it could be a long, long time before a creature from another species looks up at its planet’s night sky and asks: Where is everybody?